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2016 535i N55 Overheating - Suspect Water Pump

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Mike T. · rep 0 · May 25, 3:03 AM · 1 replies · solved · Question

Vehicle: 2016 BMW 535i (F10)

My 2016 BMW 535i (F10) recently threw a "Drivetrain Malfunction" warning, and then an "Engine Overheat" message. The fan was running super loud. I pulled over immediately. After cooling down, it seemed okay for a bit, but the issue came back. I scanned it and got codes like P007B (Ambient Air Pressure Sensor) and P007C (Ambient Air Temperature Sensor), but also P007D and P007E. I suspect the electric water pump given the symptoms and the N55's reputation.

How difficult is this repair? What parts are typically replaced along with the water pump?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:03 AM

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ClearTheCode admin answer:

Your suspicion regarding the electric water pump is very likely correct. The symptoms you describe – overheating, loud fan, and 'Drivetrain Malfunction' – are classic indicators of a failing electric water pump on BMW's N55 engine. The generic P007B-E codes might be secondary, or unrelated, but the overheating is the primary concern.

Causes:

  • Internal failure of the electric motor or control unit within the water pump.
  • Wear and tear over time, as these pumps have a finite lifespan, typically 60,000-100,000 miles.

Parts to Replace:

  1. Electric Water Pump: Essential. Use a genuine BMW or OEM equivalent part.
  2. Thermostat: The thermostat is typically replaced at the same time as the water pump. It's located near the pump and is another common failure point.
  3. Water Pump Bolts: These are often aluminum stretch bolts and should always be replaced.
  4. Coolant: You'll need to drain and refill with BMW-approved coolant (blue or green, depending on your specific model year's requirement).
  5. O-rings/Gaskets: For any coolant lines disconnected.

Difficulty: Replacing the water pump on an N55 engine is a moderately difficult DIY job. It's located low on the engine, can be challenging to access, and requires patience. You'll need to properly drain and refill the coolant and perform the electronic bleeding procedure (which can be initiated via your car's climate control or diagnostic tools) to prevent air pockets.

When to See a Shop: If you're not comfortable working in tight spaces, don't have the tools for proper coolant bleeding, or prefer professional expertise, a specialized BMW shop is recommended. They have the experience and specific diagnostic tools to ensure the repair is done correctly and the cooling system is properly bled. BMW-specific diagnostic codes for water pump failure often include: 2E81 (Electric coolant pump, speed deviation), 2E82 (Electric coolant pump, shutdown), 2E83 (Electric coolant pump, power reduced), 2E84 (Electric coolant pump, communication fault), 2E85 (Electric coolant pump, no communication), or 2E91 (Coolant temperature sensor, signal).

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